Table 5

Construct validity (convergent and discriminant validity): CROQ-CABG and CROQ-PCI correlations with EQ-5D-3L

EQ-5D-3L dimensionsEQ-5D-3L VAS score
CROQ scaleMobilitySelf-careUsual activitiesPain and discomfortAnxiety and depression
CABG prerevascularisation (n=2685)
 Symptoms−0.41−0.26−0.42−0.59−0.270.47
 Physical functioning−0.58−0.40−0.55−0.49−0.270.52
 Psychosocial functioning−0.40−0.29−0.52−0.46−0.570.55
 Cognitive functioning−0.32−0.29−0.38−0.35−0.440.41
PCI prerevascularisation (n=3711)
 Symptoms−0.46−0.30−0.46−0.59−0.320.50
 Physical functioning−0.62−0.47−0.57−0.50−0.310.56
 Psychosocial functioning−0.48−0.42−0.57−0.48−0.570.59
 Cognitive functioning−0.36−0.40−0.41−0.38−0.490.45
CABG postrevascularisation (N=869)
 Symptoms−0.43−0.37−0.52−0.50−0.470.54
 Physical functioning−0.63−0.55−0.68−0.52−0.450.60
 Psychosocial functioning−0.50−0.51−0.64−0.56−0.680.65
 Cognitive functioning−0.41−0.47−0.53−0.46−0.540.50
 Adverse effects−0.35−0.40−0.45−0.55−0.440.45
 Satisfaction−0.34−0.26−0.48−0.44−0.440.52
PCI postrevascularisation (N=837)
 Symptoms−0.53−0.38−0.56−0.61−0.440.60
 Physical functioning−0.71−0.57−0.71−0.50−0.410.68
 Psychosocial functioning−0.60−0.51−0.66−0.56−0.650.67
 Cognitive functioning−0.49−0.41−0.52−0.40−0.560.53
 Adverse effects−0.25−0.25−0.23−0.26−0.180.21
 Satisfaction−0.35−0.27−0.42−0.41−0.340.47
  • Values in bold indicate correlations between scores that purport to measure similar aspects of HRQoL.

  • The correlations with the EQ-5D-3L dimension scores are negative as higher scores on these indicate poor functioning whereas higher scores on the CROQ and EQ-5D-3L VAS score indicate better functioning.

  • CABG, coronary artery bypass surgery; CROQ, Coronary Revascularisation Outcome Questionnaire; HRQoL, health-related quality of life; PCI, percutaneous coronary intervention.